twank wtank tawnk atwnk watnk awtnk twnak wtnak tnwak ntwak wntak nwtak tanwk atnwk tnawk ntawk antwk natwk wantk awntk wnatk nwatk anwtk nawtk twakn wtakn tawkn atwkn watkn awtkn twkan wtkan tkwan ktwan wktan kwtan takwn atkwn tkawn ktawn aktwn katwn waktn awktn wkatn kwatn akwtn kawtn twnka wtnka tnwka ntwka wntka nwtka twkna wtkna tkwna ktwna wktna kwtna tnkwa ntkwa tknwa ktnwa nktwa kntwa wnkta nwkta wknta kwnta nkwta knwta tankw atnkw tnakw ntakw antkw natkw taknw atknw tkanw ktanw aktnw katnw tnkaw ntkaw tknaw ktnaw nktaw kntaw anktw naktw akntw kantw nkatw knatw wankt awnkt wnakt nwakt anwkt nawkt waknt awknt wkant kwant akwnt kawnt wnkat nwkat wknat kwnat nkwat knwat ankwt nakwt aknwt kanwt nkawt knawt
Note: these 'words' (valid or invalid) are all the permutations of the word twank. These words are obtained by scrambling the letters in twank.